1. My esp
does not include the whole NehrimData file, but yes, there are copies of quite some of the entries. Why? Because else the magic effects would get damaged! I have done this mistake in the Old-School Magic Icons before and it screwed up my game.

This is a way of doing things I do not preffer, but it's still better then beaking your game, right? (I'll see if there is another way of doing this, but so far I don't know about one.)
2. The
NehrimData.esp has duplicates of those files, because they have been changed from the master file version and in order to keep the originals (probably as refference for comparison, who knows). The fact, that this was done in the
NehrimData.esp and not the master file is also the reason for point 1 above. I am not sure, why they didn't make the changes in the master file, which would make all things easier, it's just the way it is.
@Arzakon: There are no book translations in my hotfix. It's only made to fix some stuff from the English translation, not to complete it. I am sure, the things I have fixed will be included in one of the future English pathces as well. And no, this will not make any problems with your older save games. I make the hotfix plugin while playing the game as well and no problems exist so far. There may be problems, if you uninstall the hotfix form your game and play with the old save files including it. But that is just a may be. I did try this before and no damage as well. But if someone wants to give it a really tough beta test, then they are welcomed to do so.